+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: HP Prime (/forum-5.html)
+--- Thread: [Programming] Cartesian draw functions (/thread-2565.html)
[Programming] Cartesian draw functions - gabrieljcs - 12-05-2014 08:56 PM
What are the differences between the "Cartesian" vs "Pixel" drawing functions? Is there any way to create an app which draws to a cartesian plane, like the Graphing and Geometry apps?
Sorry if I haven't made myself clear and thanks in advance.
RE: [Programming] Cartesian draw functions - Tim Wessman - 12-06-2014 04:04 PM
The non _P version reads the current x/y bounds from the application and graphs using the definied window. Thus LINE(-1,-1,1,1) will draw using your window setting from the active application between catesian coordinates (-1,-1) and (1,1) passing through 0,0. If you are not in an application that has a plot view with definiable x/y window position, the system application default will be used.
If you are trying to draw things on a plot/graph or to create your own - these are exactly the commands you should be using.
RE: [Programming] Cartesian draw functions - gabrieljcs - 12-06-2014 04:31 PM
Exactly what I needed, thanks a lot!
RE: [Programming] Cartesian draw functions - gabrieljcs - 12-06-2014 08:12 PM
Still need some help, though... couldn't manage to draw a single line on a plot.
Tried calling from "Program", didn't work -- just drew the line on the screen, on top of everything. Then tried editing inside the app, e.g.:
Code:
EXPORT Geometry()
BEGIN
IF GETKEY == 30 THEN
LINE(-1,-1,1,1);
END;
END;Would you mind clarifying a little bit?
RE: [Programming] Cartesian draw functions - toml_12953 - 12-06-2014 09:28 PM
(12-06-2014 08:12 PM)gabrieljcs Wrote: Still need some help, though... couldn't manage to draw a single line on a plot.
Tried calling from "Program", didn't work -- just drew the line on the screen, on top of everything. Then tried editing inside the app, e.g.:
Didn't work either...Code:
EXPORT Geometry()
BEGIN
IF GETKEY == 30 THEN
LINE(-1,-1,1,1);
END;
END;
Would you mind clarifying a little bit?
You have to clear the screen first with RECT();
Tom L
RE: [Programming] Cartesian draw functions - gabrieljcs - 12-06-2014 09:37 PM
I get it, but what I want to do is to draw into a "cartesian plane" (I don't really know how to call it), like the Graphing and Geometry apps do:
[attachment=1269]
RE: [Programming] Cartesian draw functions - Giancarlo - 12-06-2014 10:36 PM
Hello,
something like this?
Code:
EXPORT Cartesian_line()
BEGIN
RECT();
LINE(G0,0,10,0,-10); //axis
LINE(G0,-15,0,15,0); //axis
LINE(G0,-1,-1,1,1); // your line
WAIT(0);
END;![[Image: 67abd2fe-2ac1-45b9-bade-4ec3fda7bd7d_zps6a3f58a5.png]](http://i40.photobucket.com/albums/e230/cotruf/67abd2fe-2ac1-45b9-bade-4ec3fda7bd7d_zps6a3f58a5.png)
bye
Giancarlo
RE: [Programming] Cartesian draw functions - gabrieljcs - 12-06-2014 11:10 PM
Thanks a lot for the answer, Giancarlo.
The issue is not the axis, but the ability to move around and zoom in and out. I thought there was a way of doing it systematically and not by painfully programming a pan and zoom function (I wouldn't even know where to begin).
RE: [Programming] Cartesian draw functions - Giancarlo - 12-06-2014 11:19 PM
Hello,
as far as i know the current firmware (6940) allow to "programatic access to geometry constructions."
The quoted part was extracted from the new firmware log.
hope it helps,
bye Giancarlo
RE: [Programming] Cartesian draw functions - gabrieljcs - 12-06-2014 11:24 PM
Very interesting, I'll take a look into it. Thanks a lot, again!
If anyone would be able to give an alternative to panning the screen, that'd be great!
TIA, Gabriel